Cylinder-concave.



UNITED 'STATES PATENT rricn..

QYLIN'DER-CONCAVE.- J

SPECIFICATION forming part of Letters Patent No. 667,365, dated February 5, 1901. Application ined september 29,1900. serial No. 31,483. (No modem T0 all whom, t muy concern:

Be it known that we, ALEcK HALvERsoN and LOUIS O. SWENSEN, citizens of the United States, residing at Lyle, in the county of Mower and State of Minnesota, have invented certain new and useful Improvements in Oylinder-Ooncaves; and we do hereby declare the following to be a'f ull, clear, and eXact description of the invention, such as will enable oth.

ers skilled in the art to which it appertains to make and use the same.

Our invention has for its object to provide a yielding concave of improved construction and arrangement for use in connection with the threshing-cylinder of a threshing -machine; and to this end it consists of the novel devices and combinations of devices hereinafter described, and defined in the claim.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout both views.

Figure 1 is a side elevation, and Fig. 2 a vertical longitudinal section, showing a portion of a threshing-machine and a portion of a band-cutter and feeder, the said threshingmachine having a yielding concave constructed and arranged in accordance with our invention.

The nu meral 1 indicates the case of a threshing-machine, and the numeral 2 a portion of a band-cutter and feeder, both of which are of ordinaryoranysuitable construction. The band-cutter and feeder is shown simply to illustrate the relation of the yielding concave to the other parts of the threshing-machine,

and hence the parts thereof are not specifically noted.

Of the parts of the threshing machine proper it is only necessary to note the threshing-cylinder 3 and its cooperating toothed concave 4. The concave 4 is pivoted at 5,l and at its forward swinging end it is provided with projecting bearing -brackets 6, which.

rest upon eccentrics or similar projections 7 of atransversely-extended rock-shaft 8. This much is ordinary construction, and in connection with the rock-shaft 8 means has hitherto been employed for positively and unyieldingly securing the shaft in different positions, so as to vary the adjustment of the concavewith respect to the threshing-cylinder.

Our invention consists in placing a yielding or spring connect-ion in the devices for setting the shaft 8 and the concave 4. To this end the shaft S is provided on the outer side of' the case 1 (in which case the said shaft 8 is journaled) with an arm 9, the free end of which is connected by a yielding spring buckle or strap to one end of the hand-lever 1l, which is pivoted to the case lat-11. The free end of the lever 11 is, as shown, arranged to be adjustably set in various positions, so as to vary the normally-set position of the concave, by means of a pin or key 12, which coperates with a series of perforations 13, shown as formed in a strap 14, secured onI the case'of the band-cutter and feeder 2.

VAs theA tough grain is gradually Worked through the passagebetween the cylinder and concave the concave will be again restored to its normally-set position by the automatic'action of the spring connection. Further, in view of the said yielding concave, the threshing-machine will thresh out and clean the grain better, for the reason that there is no slugging ofthe cylinders, with the result that the Working parts of the machine are kept up to the proper speed required to do good work. Furthermore, the yielding connection is capable of 'very easy and quick application "to threshing-machines now in use at a very triiiing cost.

What we claim, and desire to secure by Letters Patent of the United States, is as follows: In a threshing-machine, the combination with the threshing-cylinder 3, of the coper` ating concave 4 pivoted at 5 and provided IOO with the bracket extension 6, the rock-shaft; In testimony whereof We ax our signa- 8 with eocenmios 7, supporting said bracket, tures in presence of two witnesses.

6,rlhe arm 9 on said rock-shaft; the ivotaed 1 lever 1l kseeumble in different:,adjuslqmen's,V K 5 by the pin or key l2 and perfola'uons 13, and

the spring buckle or strap 10 connecting said Witnesses:

arm9 to said level-'11, said parte operating E.L. STANLEY,

substantially as described. 4Elm/'ARD ARNESON. f 

